68 gmc engine perch location

[bb400ho]

hello, i need a little help. i tried to search but i get conflicting info. i have a 68 gmc short bed 2wd. i think it came with a 307 and a turbo 400. (according to a hard written receipt from the dealer) it had no engine when i got it and the frame was already sandblasted and painted. the engine perches are mounted in the 2 rear holes ( closest to the cab) i thought that the v-8's were in the front holes. if i try to move them to the forward holes they don't fit right and the bottom hole doesn't line up. are there different perches for the front holes?


thanks Bryan

[RodnRudy]

The engine perches for the V8's are different than ones for the sixes. I suspect you have 6 cyl perches that won't fit in the front location. Check in the parts for sale section, the V8 perches come up for sale onc in a while.

[bb400ho]

thanks ill look

['68OrangeSunshine]

Check the SPID.
CS = 2WD L6
CM = " V6
CE = " V8
If the SPID doesn't list displacement as a 327 or 350 V8, then it was a 307. Or a 250 if it was an L6 truck.

[bb400ho]

my truck does not have a SPID i thought it was just gone but when i was looking for some info here i saw that some gmc's didn't have one. the vin is CE
the mounts are in the rear holes. I'm putting in a 5.3 vortec. even with the dirty dingo sliders all the way forward there is only about a 1/4 inch clearance at the rear of the valve covers. is it possible that the 307 mounts or a turbo 400 trans would have mounts in the rear holes?
thanks Bryan

[Redneck Rydes]

Usually when a V8 engine was mounted in these trucks rear holes were for standard trans and front holes were for automatic trans.